On Mon, Sep 26, 2022 at 7:53 PM Christian Kohlschütter <christ...@kohlschutter.com> wrote: > > Some RK3399 boards, such as newer revisions of NanoPi R4S, do not > provide an EEPROM chip containing a globally unique MAC address. > > Currently, this means that a randomly generated temporary MAC address > may be generated each time the device is rebooted, leading to ARP cache > issues and other confusing bugs. > > Since RK3399 CPUs provide a built-in unique serial number, we can > reliably derive a locally MAC address from it by reading the > corresponding bits from the non-secure efuse block. > > Port from uboot-rockchip 0c294d0, fix compilation issues and adjust > coding style. > > rockchip: board: puma_rk3399: derive ethaddr from cpuid > rockchip: board: puma_rk3399: add support for serial# and cpuid# > rockchip: efuse: add (misc) driver for RK3399 non-secure efuse block > via efuses > > Signed-off-by: Christian Kohlschütter <christ...@kohlschutter.com> > --- > board/rockchip/evb_rk3399/evb-rk3399.c | 120 +++++++++++++++++++++++++ > configs/nanopi-r4s-rk3399_defconfig | 4 + > drivers/misc/Makefile | 2 +-
There's already code in arch/arm/mach-rockchip/misc.c that does pretty much the same thing. IIRC all you need to do is enable MISC_INIT_R and ROCKCHIP_EFUSE or ROCKCHIP_OTP. ChenYu
